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https://www.readbyqxmd.com/read/29149213/optimal-design-and-control-of-an-electromechanical-transfemoral-prosthesis-with-energy-regeneration
#1
Farbod Rohani, Hanz Richter, Antonie J van den Bogert
In this paper, we present the design of an electromechanical above-knee active prosthesis with energy storage and regeneration. The system consists of geared knee and ankle motors, parallel springs for each motor, an ultracapacitor, and controllable four-quadrant power converters. The goal is to maximize the performance of the system by finding optimal controls and design parameters. A model of the system dynamics was developed, and used to solve a combined trajectory and design optimization problem. The objectives of the optimization were to minimize tracking error relative to human joint motions, as well as energy use...
2017: PloS One
https://www.readbyqxmd.com/read/29148135/cadence-tracking-and-disturbance-rejection-in-functional-electrical-stimulation-cycling-for-paraplegic-subjects-a-case-study
#2
Lucas O da Fonseca, Antônio P L Bó, Juliana A Guimarães, Miguel E Gutierrez, Emerson Fachin-Martins
Functional electrical stimulation cycling has been proposed as an assistive technology with numerous health and fitness benefits for people with spinal cord injury, such as improvement in cardiovascular function, increase in muscular mass, and reduction of bone mass loss. However, some limitations, for example, lack of optimal control strategies that would delay fatigue, may still prevent this technology from achieving its full potential. In this work, we performed experiments on a person with complete spinal cord injury using a stationary tadpole trike when both cadence tracking and disturbance rejection were evaluated...
November 2017: Artificial Organs
https://www.readbyqxmd.com/read/29148112/big-data-and-data-science-in-healthcare-what-nurses-and-midwives-need-to-know
#3
EDITORIAL
Siobhan O'Connor
The evolution of technology in contemporary society has been accelerating in recent decades, with smaller, more interconnected hardware devices and software applications becoming the norm. As desktop computing paved the way for mobile platforms, which are now transitioning to wearable devices and other sensors, it is inevitable these electronic tools will advance into the realm of nanotechnology and biotechnology in the years to come. As the proliferation of information and communication technology continues it has led to a tsunami of digital data (Bates et al, 2014), which is being collected on many aspects of life...
November 17, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/29147731/the-influence-of-cervical-movement-on-eye-stabilization-reflexes-a-randomized-trial
#4
Britta K Ischebeck, Jurryt de Vries, Jan Paul van Wingerden, Gert Jan Kleinrensink, Maarten A Frens, Jos N van der Geest
To investigate the influence of the amount of cervical movement on the cervico-ocular reflex (COR) and vestibulo-ocular reflex (VOR) in healthy individuals. Eye stabilization reflexes, especially the COR, are changed in neck pain patients. In healthy humans, the strength of the VOR and the COR are inversely related. In a cross-over trial the amplitude of the COR and VOR (measured with a rotational chair with eye tracking device) and the active cervical range of motion (CROM) was measured in 20 healthy participants (mean age 24...
November 17, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29147730/on-the-skilled-plantar-flexor-motor-action-and-unique-electromyographic-activity-of-ballet-dancers
#5
Sakiko Saito, Hiroki Obata, Mayumi Kuno-Mizumura, Kimitaka Nakazawa
The study aimed to compare the ability of dance and non-dance subjects to perform fine control of a simple heel-raising/lowering movement, and to determine if there are any differences in motor unit activity in the primary plantar flexor muscles during the movement. Subjects were instructed to accurately track a sinusoidal trace with a heel-raising and lowering movement at four controlled frequencies (1, 0.5, 0.25, and 0.125 Hz). The ankle joint angle was used to characterize movement errors from the target...
November 16, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29146663/a-vision-and-change-reform-of-introductory-biology-shifts-faculty-perceptions-and-use-of-active-learning
#6
Anna Jo Auerbach, Elisabeth Schussler
Increasing faculty use of active-learning (AL) pedagogies in college classrooms is a persistent challenge in biology education. A large research-intensive university implemented changes to its biology majors' two-course introductory sequence as outlined by the Vision and Change in Undergraduate Biology Education final report. One goal of the curricular reform was to integrate core biological concepts and competencies into the courses using AL pedagogical approaches. The purpose of this study was to observe the instructional practices used by faculty (N = 10) throughout the 3-year process of reform to determine whether the use of AL strategies (including student collaboration) increased, given that it can maximize student learning gains...
2017: CBE Life Sciences Education
https://www.readbyqxmd.com/read/29145487/defining-external-factors-that-determine-neuronal-survival-apoptosis-and-necrosis-during-excitotoxic-injury-using-a-high-content-screening-imaging-platform
#7
Ujval Anilkumar, Petronela Weisova, Jasmin Schmid, Tytus Bernas, Heinrich J Huber, Heiko Düssmann, Niamh M C Connolly, Jochen H M Prehn
Cell death induced by excessive glutamate receptor overactivation, excitotoxicity, has been implicated in several acute and chronic neurological disorders. While numerous studies have demonstrated the contribution of biochemically and genetically activated cell death pathways in excitotoxic injury, the factors mediating passive, excitotoxic necrosis are less thoroughly investigated. To address this question, we developed a high content screening (HCS) based assay to collect high volumes of quantitative cellular imaging data and elucidated the effects of intrinsic and external factors on excitotoxic necrosis and apoptosis...
2017: PloS One
https://www.readbyqxmd.com/read/29143768/an-electronic-system-for-the-contactless-reading-of-ecg-signals
#8
Francesca Romana Parente, Marco Santonico, Alessandro Zompanti, Mario Benassai, Giuseppe Ferri, Arnaldo D'Amico, Giorgio Pennazza
The aim of this work is the development of a contactless capacitive sensory system for the detection of (Electrocardiographic) ECG-like signals. The acquisition approach is based on a capacitive coupling with the patient body performed by electrodes integrated in a front-end circuit. The proposed system is able to detect changes in the electric charge related to the heart activity. Due to the target signal weakness and to the presence of other undesired signals, suitable amplification stages and analogue filters are required...
October 28, 2017: Sensors
https://www.readbyqxmd.com/read/29142223/active-diffusion-and-advection-in-drosophila-oocytes-result-from-the-interplay-of-actin-and-microtubules
#9
Maik Drechsler, Fabio Giavazzi, Roberto Cerbino, Isabel M Palacios
Transport in cells occurs via a delicate interplay of passive and active processes, including diffusion, directed transport and advection. Despite progress in super-resolution microscopy, discriminating and quantifying these processes is a challenge, requiring tracking of rapidly moving, sub-diffraction objects in a crowded, noisy environment. Here we use differential dynamic microscopy with different contrast mechanisms to provide a thorough characterization of the dynamics in the Drosophila oocyte. We study the movement of vesicles and the elusive motion of a cytoplasmic F-actin mesh, a known regulator of cytoplasmic flows...
November 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/29141496/power-and-pacing-calculations-based-on-real-time-locating-data-from-a-cross-country-skiing-sprint-race
#10
Mikael Swarén, Anders Eriksson
Pacing strategies in cross-country skiing have been investigated in several studies. However, none of the previous studies have been verified by collected skiing data giving the skiing velocities along a measured track. These can be used to calculate the propulsive power output. Collected real-time positioning data from a cross-country sprint skiing race were used to estimate the propulsive power by applying a power balance model. Analyses were made for the time-trial and the final for one female and one male skier...
November 15, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29140769/addressing-maternal-health-during-cdc-s-ebola-response-in-the-united-states
#11
Sascha Ellington, Mirna Perez, Diane Morof, Marianne E Zotti, William Callaghan, Dana Meaney-Delman, Maleeka Glover, Quynh-Chau Ha, Denise J Jamieson
Previous outbreaks suggest that pregnant women with Ebola virus disease (EVD) are at increased risk for severe disease and death. Healthcare workers who treat pregnant women with EVD are at increased risk of body fluid exposure. Despite the absence of pregnant women with EVD in the United States, CDC activated the Maternal Health Team (MHT), a functional unit dedicated to emergency preparedness and response issues, on October 18, 2014. We describe major activities of the MHT. A high-priority MHT activity was to publish guiding principles early in the response...
November 2017: Journal of Women's Health
https://www.readbyqxmd.com/read/29140566/mesenchymal-stem-cell-preparation-and-transfection-free-ferumoxytol-labeling-for-mri-cell-tracking
#12
Li Liu, Chien Ho
Mesenchymal stem cells (MSCs) are multipotent cells and are the most widely studied cell type for stem cell therapies. In vivo cell tracking of MSCs labeled with an FDA-approved superparamagnetic iron-oxide (SPIO) particle by magnetic resonance imaging (MRI) provides essential information, e.g., MSC engraftment, survival, and fate, thus improving cell therapy accuracy. However, current methodology for labeling MSCs with Ferumoxytol (Feraheme(®) ), the only FDA-approved SPIO particle, needs transfection agents...
November 15, 2017: Current Protocols in Stem Cell Biology
https://www.readbyqxmd.com/read/29140506/quantification-of-the-effect-of-toxicants-on-the-intracellular-kinetic-energy-and-cross-sectional-area-of-mammary-epithelial-organoids-by-oct-fluctuation-spectroscopy
#13
Xiao Yu, Ashley M Fuller, Richard Blackmon, Melissa A Troester, Amy L Oldenburg
The ability to assess toxicant exposures of three-dimensional (3D) in vitro mammary models that recapitulate the tissue microenvironment can aid in our understanding of environmental exposure risk over time. Longitudinal studies of 3D model systems, however, are cumbersome and suffer from a lack of high-throughput toxicological assays. In this study, we establish a noninvasive and label-free optical coherence tomography (OCT)-based imaging platform for tracking exposure-response relationships in 3D human mammary epithelial organoid models...
November 10, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29138660/use-of-cellular-phone-contacts-to-increase-return-rates-for-immunization-services-in-kenya
#14
Evans Mokaya, Isaac Mugoya, Jane Raburu, Lora Shimp
Introduction: In Kenya, failure to complete immunization schedules by children who previously accessed immunization services is an obstacle to ensuring that children are fully immunized. Home visit approaches used to track defaulting children have not been successful in reducing the drop-out rate. Methods: This study tested the use of phone contacts as an approach for tracking immunization defaulters in twelve purposively-selected facilities in three districts of western Kenya...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/29138265/targeted-delivery-of-stat-3-modulator-to-breast-cancer-stem-like-cells-down-regulates-a-series-of-stem-ness-genes
#15
Santosh K Misra, Arun De, Dipanjan Pan
Cancer stem cells are known to be controlled by pathways that are dormant in normal adult cells, e.g. PTEN, which is a negative regulator of transcription factor STAT3. STAT3 regulates genes that are involved in stem cell self-renewal and thus represents a novel therapeutic target of enormous clinical significance. Studies on breast cancer stem cells (BCSCs) have been also significantly correlated with STATs. We describe here for the first time a novel strategy to selectively target CSCs and to induce downregulation of STAT3 downstream target genes reducing expression of series of 'stem-ness genes' in treated tumors...
November 14, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/29137172/fluorescent-magnetopolymersomes-a-theranostic-platform-to-track-intracellular-delivery
#16
Oliver Bixner, Noga Gal, Christoph Zaba, Andrea Scheberl, Erik Reimhult
We present a potential theranostic delivery platform based on the amphiphilic diblock copolymer polybutadiene-block-poly (ethylene oxide) combining covalent fluorescent labeling and membrane incorporation of superparamagnetic iron oxide nanoparticles for multimodal imaging. A simple self-assembly and labeling approach to create the fluorescent and magnetic vesicles is described. Cell uptake of the densely PEGylated polymer vesicles could be altered by surface modifications that vary surface charge and accessibility of the membrane active species...
November 13, 2017: Materials
https://www.readbyqxmd.com/read/29137157/in-situ-synthesis-of-silver-nanoparticles-in-a-hydrogel-of-carboxymethyl-cellulose-with-phthalated-cashew-gum-as-a-promising-antibacterial-and-healing-agent
#17
Ana Karina Marques Fortes Lustosa, Antônia Carla de Jesus Oliveira, Patrick Veras Quelemes, Alexandra Plácido, Francilene Vieira da Silva, Irisdalva Sousa Oliveira, Miguel Peixoto de Almeida, Adriany das Graças Nascimento Amorim, Cristina Delerue-Matos, Rita de Cássia Meneses de Oliveira, Durcilene Alves da Silva, Peter Eaton, José Roberto de Souza de Almeida Leite
Silver nanoparticles have been shown to possess considerable antibacterial activity, but in vivo applications have been limited due to the inherent, but low, toxicity of silver. On the other hand, silver nanoparticles could provide cutaneous protection against infection, due to their ability to liberate silver ions via a slow release mechanism, and their broad-spectrum antimicrobial action. Thus, in this work, we describe the development of a carboxymethyl cellulose-based hydrogel containing silver nanoparticles...
November 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29137127/physical-activity-of-german-children-and-adolescents-2003-2012-the-momo-study
#18
Steffen C E Schmidt, Annette Henn, Claudia Albrecht, Alexander Woll
Organized and unorganized physical activity (PA) hold an important role in the daily life of children and adolescents. Regular representative tracking of PA in different settings is important to evaluate social trends and implemented interventions. In this paper, representative PA data of German children and adolescents from the MoMo Baseline-Study (2004, n = 4528) are compared to those of Wave 1 (2010, n = 3994). Participants aged 4-17 were drawn out of 167 sample points in Germany and the data was weighted to ensure representativeness...
November 11, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29136190/the-genotype-phenotype-relationships-in-the-light-of-natural-selection
#19
Han Chen, Chung-I Wu, Xionglei He
Although any genotype-phenotype relationships are a result of evolution, little is known about how natural selection and neutral drift, two distinct driving forces of evolution, operate to shape the relationships. By analysing ∼500 yeast quantitative traits we reveal a basic "supervisor-worker" gene architecture underlying a trait. Supervisors are often identified by "perturbational" approaches (such as gene deletion), while workers, which usually show small and statistically insignificant deletion effects, are tracked primarily by "observational" approaches that examine the correlation between gene activity and trait value across a number of conditions...
November 9, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/29136179/fluorescently-tagged-human-eif3-for-single-molecule-spectroscopy
#20
Alex G Johnson, Alexey N Petrov, Gabriele Fuchs, Karim Majzoub, Rosslyn Grosely, Junhong Choi, Joseph D Puglisi
Human translation initiation relies on the combined activities of numerous ribosome-associated eukaryotic initiation factors (eIFs). The largest factor, eIF3, is an ∼800 kDa multiprotein complex that orchestrates a network of interactions with the small 40S ribosomal subunit, other eIFs, and mRNA, while participating in nearly every step of initiation. How these interactions take place during the time course of translation initiation remains unclear. Here, we describe a method for the expression and affinity purification of a fluorescently-tagged eIF3 from human cells...
November 9, 2017: Nucleic Acids Research
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